Not really, no.
The point of Freesync is to stop screen tearing without adding any additional input lag & without locking your frame rate to 60, 30, etc. If you use Vsync, it negates the purpose of Freesync because it locks your frame rate and increases input lag.
Keep Freesync on, Vsync off, and limit your frame rate to 1 FPS lower than the peak of your Freesync range for optimal adaptive sync settings

I remember when many claimed that this console would drive Nintendo into the ground.
In hindsight, Nintendo exclusives (including the critically acclaimed BotW & Mario Odyssey) + family/entertainment system + portability for $299 is a deadly combo. Now that other AAA titles such as Doom and Wolfenstein are coming to the console too, it looks like they have a real winner on their hands.

It definitely does, but people generally use that in context with DDR4, Ryzen, and Intel's 6th gen and beyond processors.
There are some niche cases, such as in Fallout 4, where DDR3 RAM speed can make a significant difference. Of course, jumping from 1333 to 2400 will reap large benefits. I'm not entirely sure how great the scaling is though.

I say build now. I don't think RAM prices will change much between now and when B360 boards arrive. You have a confirmed upgrade path until 2020, and the Ryzen 3 1200 offers great value for the price. It was just $79 earlier today.

Minus the viewing and subscription requirements, you could
lie about your age (I do not recommend)
Use adsense through your parent's email
Use an agency/network such as Fullscreen - the minimum age is 13 for Fullscreen specifically
Clearly, I think highly of the second & third bullet and not the first . If they find out about your age, your account will be terminated. It's happened to me before unfortunately (I was also really stupid about keeping it low-key).
Besides that, you need build some internet rapport and meet those statistics before applying to a network or Google Adsense. So grab that camera/mic and get to recording! Good luck!

Haha it's only the CPU (though adding a GPU block would only make it $20 more or so) - but lots of research and time to pick out the components. It's an experiment to see if it works or not. I'll definitely report back.